極低流量域における遠心ポンプのキャビテーションに伴う不安定現象

抄録

Low cycle pressure oscillations often occur in cavitating pumps operated in the range of low flow rates. Several types of oscillations have been found to exist, corresponding to flow rate and NPSH. The instability phenomena occurring in a centrifugal pump system at extremely low flow rate conditions were investigated by measuring pressure fluctuations at the suction pipe and observing the cavitation behavior there with a high-speed video system. The cavitation compliance and mass flow gain factor were calculated with the aid of experimental data. The transfer matrix method was used to analyze the system stability, and the results were compared with the experimental ones.